Note: See the questions of this exercise in section ANNEX 24:.
SEAMCAT parametrisation of simulation scenario TETRA versus FM.
1. SYSTEMS:
1.1 FM as Victim Link
- Name: FM
- Frequency: Constant 412.00625 MHz (channel spacing)
1.1.1 Transmitter: FM MS (VLT)
Transmitter Identification
Antenna pointing
- Antenna height: 1.5 m, constant
- Antenna azimuth: 0...360 degrees, uniform
- Antenna elevation: 0 degrees, constant (horizontal direction)
Antenna Pattern Identification
- Description: Omni-directional
- Maximum gain: 0 dBi
Emission Characteristics
1.1.2 Receiver: FM BS (VLR)
Receiver Identification
Antenna pointing
- Antenna height: 30 m, constant
- Antenna azimuth: 0...360 degrees, uniform
- Antenna elevation: 0 degrees, constant (horizontal direction)
Antenna Pattern Identification
- Description: Omni-directional
- Maximum gain: 9 dBi
Reception Characteristics
- Noise floor: -131 dBm, constant(=Sensitivity – C/I)
- Blocking mode: Sensitivity
- Blocking mask: -23 dB, constant
- Intermodulation rejection: 0 dB, constant
- Sensitivity: -110 dBm
- Reception bandwidth: 8 kHz
- Overloading: NO
Interfering Criteria
- C/I: 21 dB (if only C/I, then C/(N+I) and (I+N)/N are not required)
- C/(I+N): 21dB (C/(N+I) required only for selected Blocking-Mode)
1.1.3 Transmitter to Receiver path (VLT - > VLR)
Relative location
- Correlation: None
- Path azimuth VLR: Uniform distribution 0 to 360 degrees
- Path distance factor: Uniform polar, 1*cell radius
Coverage radius
- Cell radius mode: User-defined radius
- Fixed radius: 7.8 km
Local environment:
- Receiver: 100% outdoor
- Transmitter: 100% outdoor
Propagation model
- Model: Extended Hata
- Variation: Yes
- General environment: RURAL (results in lowest path attenuation)
- Propagation environment: ABOVE ROOF (with a 30 m FM BS-Antenna height)
1.2 TETRA as Interfering Link
- Name: TETRA
- Frequency: 410.1875…411.9875 MHz, uniform
1.2.1. Transmitter: TETRA MS (ÍLT)
Transmitter Identification
Antenna pointing
- Antenna height: 1.5 m, constant
- Antenna azimuth: 0...360 degrees, uniform
- Antenna elevation: 0 degrees, constant (horizontal direction)
Antenna Pattern Identification
- Description: Omni-directional
- Maximum gain: 0 dBi
Emission Characteristics
- Power: 30 dBm, constant
- Emission Mask:
Unwanted mask: Offset in MHz, power in dBc referred to Reference bandwidth
-10.0000 -100.0000 18.0000
-0.5010 -100.0000 18.0000
-0.5000 -80.0000 18.0000
-0.2510 -80.0000 18.0000
-0.2500 -75.0000 18.0000
-0.1000 -75.0000 18.0000
-0.0750 -66.0000 18.0000
-0.0500 -66.0000 18.0000
-0.0250 -60.0000 18.0000
-0.0125 0.0000 18.0000
0.0125 0.0000 18.0000
0.0250 -60.0000 18.0000
0.0500 -66.0000 18.0000
0.0750 -66.0000 18.0000
0.1000 -75.0000 18.0000
0.2500 -75.0000 18.0000
0.2510 -80.0000 18.0000
0.5000 -80.0000 18.0000
0.5010 -100.0000 18.0000
10.0000 -100.0000 18.0000
- Transmitting bandwidth: 18 kHz (Bandwidth < channel)
- Reference bandwidth: 18 kHz
- Unwanted emission floor: NO
- Power control:
- Power Control step size: 5 dB
- Min Threshold: -86 dBm
- Dynamic Range: 15 dB
1.2.2 Receiver: TETRA BS (ILR)
Receiver Identification
Antenna pointing
- Antenna height: 30 m, constant
- Antenna azimuth: 0...360 degrees, uniform
- Antenna elevation: 0 degrees, constant (horizontal direction)
Antenna Pattern Identification
- Description: Omni-directional
- Maximum gain: 11 dBi
Reception Characteristics
- Noise floor: -125 dBm, constant(=Sensitivity – C/I)
- Blocking mode: User defined
- Blocking mask: 0 dB, constant
- Intermodulation rejection: 0 dB, constant
- Sensitivity: -106 dBm
- Reception bandwidth: 18 kHz
- Overloading: NO
Interfering Criteria
- C/I: 19 dB (if only C/I, then C/(N+I) and (I+N)/N are not required)
- C/(I+N): 16 dB (C/(N+I) required only for selected Blocking-Mode)
- (N+I)/N: 3 dB
- I/N: 0 dB
1.2.3 Transmitter to Receiver path (ILT - > ILR)
Relative location
- Correlation: None
- Path azimuth VLR: Uniform distribution 0 to 360 degrees
- Path distance factor: Uniform polar 1*cell radius
Coverage radius
- Cell radius mode: Traffic limited network
- Density: 5
- Nr. of channels: 80
- Nr. of users per channel: 1
- Frequency cluster: 9
Local environment:
- Receiver: 100% outdoor
- Transmitter: 100% outdoor
Propagation model
- Model: Extended Hata
- Variation: Yes
- General environment: RURAL(results in lowest path attenuation)
- Propagation environment: ABOVE ROOF (with a 30 m TETRA BS-Antenna height)
2. SCENARIO
2.1. VICTIM SYTEM
- Victim System: FM
- Frequency: Constant, 412.00625
2.2. SIMULATION CONTROL
2.3. INTERFERING SYSTEM LINKS
- Link1: TETRA
- Frequency: 410.1875…411.9875 MHz, uniform
2.4 ILT -> VLR path
Relative positioning of the interfering link
- Mode: Uniform density
- Position relative to: Victim Link Receiver
- Delta X: Constant, 0
- Delta Y: Constant, 0
- Set ILR at the centre of the distribution: NO
- Path azimuth: Uniform distribution, 0 to 360 degrees
- Number of active transmitters: 9
- Minimum coupling loss: Constant, 0
- Protection distance: Constant, 0
Interferers density
- Density of Tx: 5 * 1/Km2
- Probability of transmission: 1
- Activity: Constant, 1
- Time: 1 hour
Propagation Model
- Model: Extended Hata
- Variation: Yes
- General environment: RURAL(results in lowest path attenuation)
- Propagation environment: ABOVE ROOF (with a 30 m FM BS-Antenna height)
3 RESULTS
Test of the simulation
Calculated radius
- Coverage radius (wanted system): 7.8 km
- Coverage radius (interfering system 1): 0.7522 km
- Simulation radius 1: 0.7569 km
Generated Signals
PC “on”
- dRSS: mean: -69.9 dBm, std: 11.68 dB
- iRSSunwanted: mean: -127.5 dBm, std: 10.86 dB
- iRSSblocking: mean: -144.6 dBm, std: 7.13 dB
PC “off”
- dRSS: mean: -69.8 dBm, std: 11.78 dB
- iRSSunwanted: mean: -112.6 dBm, std: 10.84 dB
- iRSSblocking: mean: -129.6 dBm, std: 7.19 dB
Interference calculation/ICE calculation
- Interference Criteria: C/I
- Compatibility mode: Yes (Probability of interference)
- Unwanted emissions: Yes
- Blocking: Yes
Results
PC “on”
- Probability of interference: 1 %
PC “off”
- Probability of interference: 8.4 %